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29 results on '"Takayanagi, Yuji"'

25. Polarimetric Enhancement in Radar Channel Imagery

Author

Yamaguchi, Yoshio, Takayanagi, Yuji, Boerner, Wolfgang-Martin, Eom, Hyo Joon, and Sengoku, Masakazu

Subjects
raio applications, polarimetry, SAR
Abstract

This paper applied the polarimetric filtering principle to Synthetic Aperture Radar (SAR) image sets in three possible polarimetric radar channels and compared the resultant imagery. The polarimetric radar channels in consideration here are Co-Pol, Cross (X)-pol, and Matched (M)-pol channels. Each channel has its own polarimetric characteristics for imaging. Using the formulation of the contrast enhancement factors based on the Stokes vector formalism, polarimetric enhanced images for three channels are shown using NASA JPL DC-8 AIRSAR data sets (CC0045L, Bonanza Creek, AK/USA). It is shown that the optimally enhanced Co- and X-Pol channel images play a decisive role in imaging in a complex featured background.

Published
1995

27. 平行平板ターゲットによる Polarimetric Calibration

Author

北山, 健志, 高柳 , 雄二, 山口, 芳雄, 山田, 寛喜, Kitayama, Kenji, Takayanagi, Yuji, Yamaguchi, Yoshio, Yamada, Hiroyoshi, 北山, 健志, 高柳 , 雄二, 山口, 芳雄, 山田, 寛喜, Kitayama, Kenji, Takayanagi, Yuji, Yamaguchi, Yoshio, and Yamada, Hiroyoshi

Abstract

Polarimetricレーダで，正確な散乱行列を得るためには偏波に対する校正が必要となる．偏波に関する誤差として，アンテナのアライメント，システム誤差等がある．Polarimetric Calibrationには，校正用ター ゲットを使用するが，ターゲットの種類により散乱行列の性質が異なる．本論文では，物理的に理解しやすい線 状ターゲットによりPolarimetric Calibrationを試みた．線状ターゲット，すなわち波長に比べて細い線状導体のwireはRCSが非常に小さい．そのため，広帯域でかつRCSが大きく線状ターゲットとして動作する平行平板 ターゲットを提案し，理論解析および校正実験からそのPolarimetric Calibrationの有効性を明らかにしている．

Published
1998

28. SB-2-5 最適偏波状態による地中埋没物体の分類

Author

高柳, 雄二, 山口, 芳雄, 山田, 寛喜, 藤本, 京平, 仙石, 正和, Takayanagi, Yuji, Yamaguchi, Yoshio, Yamada, Hiroyoshi, Fujimoto, Kyohei, Sengoku, Masakazu, 高柳, 雄二, 山口, 芳雄, 山田, 寛喜, 藤本, 京平, 仙石, 正和, Takayanagi, Yuji, Yamaguchi, Yoshio, Yamada, Hiroyoshi, Fujimoto, Kyohei, and Sengoku, Masakazu

Published
1994

29. Relationships between Skin Carotenoid Levels and Metabolic Syndrome.

Author

Takayanagi, Yuji, Obana, Akira, Muto, Shigeki, Asaoka, Ryo, Tanito, Masaki, Ermakov, Igor V., Bernstein, Paul S., and Gellermann, Werner

Subjects
METABOLIC syndrome, REFLECTANCE spectroscopy, SMOKING, LOGISTIC regression analysis, PERIODIC health examinations, HIGH density lipoproteins
Abstract

Carotenoids have potential antioxidant and anti-inflammatory effects; their protective roles are of particular interest in the pathogenesis of metabolic syndrome (MetS). The reflection spectroscopy method has been recently developed to noninvasively measure skin carotenoid (SC) levels, which highly correlates with serum concentration of carotenoids. The relationship between SC levels and metabolic syndrome has been investigated. We aimed to identify the differences in patient characteristics and SC levels between participants with and without MetS in a large health examination population. In addition, the relationships between SC levels and various clinical parameters related to MetS were investigated. SC levels were measured using a reflection spectroscopy. A total of 1812 Japanese participants (859 male, 953 female; mean age ± standard deviation (SD), 57.8 ± 11.0 years) comprised the study population, i.e., participants with MetS (n = 151) and those without MetS (n = 1661). Multivariate logistic regression analysis was performed to identify variables associated with MetS. Compared to controls (377.3 ± 122.8), SC indices were significantly lower in patients with MetS (340.7 ± 112.5, p = 0.0004). Multivariate models also suggested that lower SC was significantly associated with MetS after adjustment for age, sex, smoking habit, and other potential risk factors for MetS. Furthermore, male gender (p < 0.0001), smoking habit (p < 0.0001) and worse lipid profiles (i.e., serum triglyceride (r = −0.1039, p < 0.0001), high-density lipoprotein (r = 0.1259, p < 0.0001), and usage of hypolipidemic agents (p = 0.0340)) were significantly associated with lower SC levels. The current study indicated that lower SC levels were significantly associated with MetS. This study highlights the antioxidant capacity of carotenoids in patients with MetS and the clinical utility of non-invasive and cost-effective SC measurement to detect participants who are at risk of developing MetS in a large population. [ABSTRACT FROM AUTHOR]

Published
2022
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